Pneumatic shock-absorber.



` L. E. PARROTT. `BNBUMATIG SHOCK ABsoRBER. APPLaATIoN FILED 0011.16,1912.

-Lfly PatentedJulyLlQla 'l gf/Dawg@ 1 hAbsorbers, fof

- TED I', LLOYD inthe county of -Clieboyganv and 'State of Michigan,

specification.

` f This invention relates to pneumatic spring j liable device of theclass referred; to,

checks or shockv absorbers, the object of the invention being to providea simple and frewhich is especially designed [for use upon the springsof automobiles, motor trucks, and all classes of sel-propelled'vehicles.

' One of the main objects of the invention is to compactly arrange thepneumatic check mechanism within the ordinaryconfines' or boundaries ofthe spring and the frame with which thespring is connected, so that theappearance of the machine will not be detracted lfrom, nor anyprojecting parts left. With the above and other objects in view,

the invention consists in the construction,V

combination and arrangement of parts, as will be hereinafter more fullydescribed,

illustrated in the accompanying drawings,v

and pointed out in the claims hereunto appended.

The accompanying drawing represents the pneumatic. check device of thisinvention,

the device being shown applied tothe spring and frame, and parts beingbroken away to better illustrate the Construction involved.

Referring to the drawings, 1 designates a yoke designed to be secured tothe frame of The yoke lis provided with the downwardly extending andhook-shaped end portions 2, to which the opposite ext-reinities of theordina-ry leaf spring 3 are connected, the connections between theextremities of the springend the extremities of the downwardly extendingarms 2 being shown as consisting of pivotal and swinging links 4, thisbeing the usual construction employed iny automobiles.

f 5 designates the clip which usually connects 'the center of the spring3 and the axle of the machine. ln carrying out this invention, the clip`5 is provided with an iipstanding post 6 having alaterally projectingpin 7 thereon.. Above the post 6 and in vertical alinement therewith isanother post Swhich is threaded, as shown. at 9, -to ,render the sameadjustable through a threaded opening in the yoke 1.A A bumper spring 10is nter- El Paniio'r'r, La: citizen ofgthe United States, residing atTopin'abee, iistable,

have invented new. andV `useful `Improvements in Pneumatic Shockwhichthe following is a l fromtherenter thereof, are two air cylinany'.variation', in

1 rateattisaiy i, isis..

posed between theposts G. andy 8, as shown, to

sustain thaishocks imparted to the machine and wheels, andby vmakingthepost 8 ad- .10 may be corres-pondingly adjusted to suit the loadsimposed thereon.

the tension 'of the bumper. spring- Secured to the yoke 1,",aboutequi-distant 4ders 11j, in which are arranged reciprocatory pistons 12,the connecting rods 13 ci which extend towardthe center oit the device,where they connect pivotally, at` le, to the shorter arms 15 of a pairof bell crank levers,

on brackets 18 rigidly connected to the yoke 1, and extending downwardlytherefrom.

The longer arms 160i the bell crank levers are provided withlongitudinal slots 18 whichreceive thepin 7 extending laterally from thepost 6, 4as hereinabove described.

It will be observed that when there is a sudden thrust downward on thebody of the vehicle, the clip 5 moving toward the body oi the vehiclecarries the `longer arms of the bell crank levers upward, thereby movingtlie pistons 12 within their respective cylinders, which are arrangedhorizontally beneath the yoke 1, so'as tobe out of the way, and so thatthe spring 3 will not come in contact therewith.

` In the outer end-of each cylinder is ar `ranged an inlet relief valve19 having a closing spring 20, the tension of which is adjustable bymeans of a nut 21. Each cylinder isalso provided in its outer end withan outl t relief valve Q2 controlled by a spring 2 the tension of whichis adjustable by means of a nut 24.

By adjusting the inlet and outlet relief valves, the resistance'to theback and forth the longer arms of which ,are designated at 16.

These levers are-pivotally supported, at 17,

movements of the pistons `may be nicely regulated to suit the loadsimposed upon the springs. r

'From the foregoing description, it will be seen that the sudden shocksimparted to the machine and the wheels thereof areabsorbed n by thepneumatic check mechanism which acts in conjunction with the usualsupporting spring, preventing said spring `from acting toosuddciily,vaiid also relieving the ice stress thi-own on thc spring,when' the wh eels drop suddenlyintoa deep rut or strike a seriousobstruction. Allnet the mechanism oi' the spring check deviceis locatedbetween the spring and theyoke to which thespring is connected, and insuch manner `as to preventv any interference therewith and inpirythereto,'When sudden shocks occur. What is claimed is:

A pneumatic spring check device adapted :tor attachment as a whole to aVehicle, comprising in combination,l a yoke having downwardlyprojectingend portions, a leaf spring terminally supported by said end portions ofthe yoke, a clip secured to the central part of the spring, oppositelyarraned horizontal cylinders attached to the yoke and provided with airvalves, pistons insaid cylinders, bell-crank levers having a slidingconnection with said clip, and rods connecting the bell-crank levers andpistons.

2. Apneumatic spring check device adapt` ed for attachment as a whole toa vehicle, comprising in combination. a yoke having downwardlyprojecting end ortions, a leaf spring terminally supported) by said endportions of the yoke, a clip secured 'to the central part of the spring,oppositely arranged cylinders attached to the yoke and extendinorhorizontally, bell crank levers havi ing a sli ing connection With saidclip', rods connecting the elbow levers and pistons, posts on the springclip and yoke, and al bumper spring connectin said posts, one of saidposts being adjusta le to regulate the tension of the bumper spring.

In testimony whereof aix my signature in presence of tivo Witnesses.

LLOYD E. PARROTT.

Witnesses Y GEO. S. OsrRANDER, Amm PRATT.

